Hai vais - A word that people use when they don’t know what they’re say

A word that people use when they don’t know what they’re saying. It’s like swearing without knowing the swear word.

'Hai vais,' he said. I asked him what that meant. He said, 'It just means I’m tired.'

She texted me, 'Hai vais,' and then ignored my 10 replies. I think she’s mad at me.

At the restaurant, he said, 'Hai vais,' and then ordered pizza. No one else understood it.